/Engine/Source/Editor/UnrealEd/Classes/Editor/EditorEngine.h
Get a Subsystem of specified type
[UEditorSubsystem](API\Editor\EditorSubsystem\UEditorSubsystem) * GetEditorSubsystemBase ( [TSubclassOf](API\Runtime\CoreUObject\Templates\TSubclassOf)< [UEditorSubsystem](API\Editor\EditorSubsystem\UEditorSubsystem) > SubsystemClass ) const